Project Completion Report for Yokosuka Degaussing Range, U.S. Fleet Activities, Yokosuka, Japan

摘要

The concept of using jetted fiberglass reinforced plastic tubes which would house deep and medium range magnetometers of the degaussing range at Yokosuka, Japan, was adopted after the jetting and proofloading of test tubes proven satisfactory and more economical than the initial concept using driven wooden piles in combination with the plastic tubes. The new degaussing range was to have the same base line bearing and location as the existing range was moved two feet south in an effort to avoid existing range piles and to facilitate the jetting operation of the tubes in relatively murky water. The new deguassing range has 20 medium range coils (-60 feet from mean low water level) spaces at 20' and 10 deep range coils (-80 feet from M.L.W.L.) spaced at 30' all housed in 6-in diameter green thread fiberglass reinforces plastic tubes. Three different tube pile lengths were used each one requiring a single splice of two tubes as shipped to the site. Additional preparation of the tubes consisted of inserting wooden jetting tips. The magnetometer coil electrical cables run trough for the last 100 feet to shore, and are bundled in a 12 inch diameter PVC pipe as they continue through the existing steel bulkhead to the range house. The tube piles were jetted into the sea floor and later inspected for compliance with specified tolerances. The tubes did fall within the allowable tolerances for locations and inclination. This information is recorded on the as-built drawing and in the figures and appendices of the completion report.